Self-adjusting grinding-disk.



ROBERT A. REYNOLDS, OF PORT.HURON, MICHIGAN.

SELF-ADJUSTING GRINDING-DISK.

Specification of Letters Patent.

Patented Sept. 2, 11913.

Application filed February 27, 1913. Serial No. 750,954.

To all iii/2.0m it may concern Be it known that I, ROBERT A. RnrNoLns, a citizen of the United States, residing at Port Huron, county of St. Clair, and State ,of hlichigan, have invented certain new and This invention relates to a sel'f-ad'ustiiw stationary disk for a grinding machine.

It has for its object structure devised to support the stationary grinding disk so that the stationary disk may accurately and automatically parallel itself with a revolving grinding disk.

In the drawings z- Figure 1, is a side elevation of the grinding machine, the grinding disk housing and hopper being broken away and sectioned. Fig. 2, is a sectional detail of the self-adjusting grinding disk support and adjacent parts.

A, indicates the base of the grinding machine. 11. and 2 represent pillow-blocks that rotalably support the shaft 3. The two bearings are completed by the pillow-block caps 4 and 5. The end of the base A is formed into a grinding disk housing 6 that is closed by a cover plate or stationary grinding disk support 7. The circular opening of the housing (Sis bordered by an annular flange S to which the disk support 7 .is loosely attached by the screw-bolts 9 which pass through the holes 10 which are considerably larger than the bolts. Attached to the base A by the legs 11, only one of which is shown in the drawings, is the hopper 12 which has a spout portion 13 that passes through the bearing ring let and is arranged to slide therein. Spiral springs 15 are attached at one end to the hopper 12 and at the other end to the bearing ring 14 so as to act as spacers for these two members. Likewise the springs 16 press against the bolt heads 9 and the stationary disk support 7 tending to thrust the disk support yieldingly into the opening of the housmg.

The end. of the shaft 3 that lies in the housing 6 has a head that forms a revolving disk support 17. Upon this is supported the revolving disk 18. A comspherical and concentric. surtaces ot the periphery oil? both the stapanion stationary disk 1%) is supported by the stationary disk support 7.

Referring to Fig. 2, it will be seen that the contour of the wall of the housing (3 at its opening appears at 20 in this figure as a portion of a circle. There is an opening in the center of the cover plate or stationary disk support 7 and examination of this opening will show that this appears as a portion of a circle at 21. The contour of these two last mentioned surfaces is in reality a part of a sphere and the circles, upon which the parts of circles, shown in this figure, are struck have a connnon centcr at 22. These two surfaces are part- Similarly the tionary disk support 7 and the bearing ring 14L are part-spherical and concentric, their center being at. 22. This arrangement allows of the tilting laterally of the disk support 7 upon the ring bearing i l.

The hopper 12 is a fixed member and will be so referred to in the claims. The ring bearing H is a member slidable with respect to the fixed membe' and the station ary disk support 7 is capable of a very limited rotation due to the loosenoss oi the bolts 5) in the bolt holes 10 and capable o'li a limited tilting movement upon the ring bearing 14 and in the part-spheriral seat of the housing. The springs 1(3 and 15 tend to thrust the disk support 7 into its seat and against the revolving disk 18. The revolving disk 18 is thrust toward the stationary disk 15) by the springs 23 that are coiled upon the guide-pins upon which the wedge block slides. A wedge-faced lever 26 is fast to the stub sha'lt 27 that thrusts upon the thrust-washers 28. These tln'ustwasl1ers engage with the end of the shaft 3.

It will be understood that by turning the wedge 't'ace lever 26 down 'lrom the position shown in Fig. 1, that the grinding disks will be brought into closer relation and in working position. l'Vhen this is done, it may be that the stationauv grinding disk is not in an exactly parallel plane with the revolving grinding disk as is desirable For the most ellicient grinding, but, inasmuch as the stationary grinding disk is held upon a yieldablc support, which is capable o'l both tilting and limited rotatiw movement, the stationary grinding disk will be adjusted to exact parallelism with the revolving grinding disk when that member starts to revolve, as it will strike the protruding portions of the stationary grinding disk and cause the stationary grinding disk to assume a position wherein it will not bestruck by the rotating grinding disk.

I employ springs to press the stationary disk inward, that are about one and onehalf or two times as strong as the springs 23 that thrust the rotating grinding disk toward the stationary grinding disk. The shaft 3 carries a drive pulley 29 which is driven by a belt 30. A belt 31 that connects with the shaft 3 drives a second shaft 32 upon which is the feed screw 33 near the mouth of the hopper 12. A second feed screw 34 is fastened to the end of the re volving shaft 3 and tends to convey the grain through an opening in the disk 19.

What I claim is 1. In a grinding machine, the combination of a rotatable disk, a stationary disk, a stationary disk support therefor provided with a part-spherical periphery, means for yieldingly thrusting the stationary disk into proximity to the rotating disk, a'housing provided with a part-spherical seat in which the part-spherical periphery of the stationary disk support fits and a bearing ring pro vided with a part-spherical and concentric periphery upon which the surface of a complementary concavity at the center of the stationary disk support bears, substantially as described.

2. In a grinding machine, the combination of a rotatable grinding disk, a stationary grinding disk, a stationary grinding disk support provided With a part-spherical peimity thereto, a stationary disk support provided with a part-spherical periphery and a part-spherical central hole, a feed hopper having a spout portion protruding through the central hole, a housing provided witha part-spherical seat into which the partspherical periphery of the stationary disk support fits, a bearing ring slidable upon said feed hopper spout and provided with a part-spherical periphery that fits into the part-spherical central hole of the stationary disk support and means for yieldingly thrusting the bearing ring toward the rotating disk, substantially as described.

4. In a grinding machine, the combination of a housing provided with a partspherical seat, a rotating grinding disk supported therein, a stationary grinding disk in proximity thereto, a stationary disksupporthaving a part-spherical periphery that fits in the part-spherical seat of the housing, a fixed hopper provided with a spout engaging through central opening of the stationary disk support, the said'stationary disk support being provided also with a central part-spherical cavity, a bearing ring provided with a part-spherical periphery that fits into the part-spherical cavity of the stationary disk support and that is slidable upon the spout of the feed hopper, the said part-spherical surfaces having a common center, and springs spacing the feed hopper and the bearing ring, substantially as de scribed.

5. In a grinding machine, the combination of a part-spherical member, a stationary grinding disk support provided with a part spherical central aperture that fits over the part-spherical surface of the part-spherical member, a stationary grinding disk attached to the stationary grinding disk support, a

ROBERT A. REYNOLDS.

Witnesses i STUART C. BARNES, VIRGINIA C. SPRATT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). C. 

